Invention Grant
- Patent Title: Active noise reduction system
- Patent Title (中): 主动降噪系统
-
Application No.: US13035393Application Date: 2011-02-25
-
Publication No.: US08903101B2Publication Date: 2014-12-02
- Inventor: Markus Christoph , Michael Wurm , Michael Perkmann
- Applicant: Markus Christoph , Michael Wurm , Michael Perkmann
- Applicant Address: DE Karlsbad
- Assignee: Harman Becker Automotive Systems GmbH
- Current Assignee: Harman Becker Automotive Systems GmbH
- Current Assignee Address: DE Karlsbad
- Agency: O'Shea Getz P.C.
- Priority: EP10154629 20100225
- Main IPC: G10K11/16
- IPC: G10K11/16 ; G10K11/178

Abstract:
A system for actively reducing noise at a listening point, includes an earphone housing, a transmitting transducer, a receiving transducer and a controller. The transmitting transducer converts a first electric signal into a first acoustic signal, and radiates the first acoustic signal along a first acoustic path having a first transfer characteristic and along a second acoustic path having a second transfer characteristic. The receiving transducer converts the first acoustic signal and ambient noise into a second electrical signal. The controller compensates for the ambient noise by providing a noise reducing electrical signal to the transmitting transducer. The noise reducing electrical signal is derived from a filtered electrical signal that is provided by filtering the second electrical signal with a third transfer characteristic. The second and the third transfer characteristics together model the first transfer characteristic.
Public/Granted literature
- US20110206214A1 ACTIVE NOISE REDUCTION SYSTEM Public/Granted day:2011-08-25
Information query